Sterile Allogeneic Spongioflex® Allograft as Partial Meniscal Replacement After Incomplete Meniscal Loss

Inclusion Criteria: 1. Patients (male and female) with: 2. Partial loss of portions of the * lateral meniscus and lateral joint line pain OR * medial meniscus and medial joint line pain 3. sufficient standing of the peripheral rim, so that the procedure can be performed 4. Age: 18-60 years 5. signed written informed consent to the study and to provide the scientific data in pseudonymized form Exclusion Criteria: 1. The presence of anterior cruciate ligament insufficiency which is not resolved by reconstruction of the anterior cruciate ligament within 16 weeks after partial meniscal implantation. 2. Axial deviation (\>2° varus or valgus) 3. realignment osteotomy not performed within 12 weeks 4. advanced cartilage damage (grade III according to ICRS) and osteoarthrosis in the affected compartment (grade III according to Kellgren and Lawrence \[33\]) 5. Extension deficit of more than 3° compared to the opposite side or a knee flexion of less than 125° 6. inflammatory arthritis or synovitis on the treated knee 7. BMI greater than 30 kg/m² 8. \<18 years, \>60 years 9. Chronic pain patients 10. only for patients who will be operated: 1. with increased anaesthesiologic risk, e.g., with known or predicted difficult airway 2. with increased risk of bleeding 3. with increased risk of infection 4. with necrotic, infected, or poorly perfused host sides 5. history of allergic reactions 6. acute hypersensitivity reactions to the IMP or any of its excipients 7. pregnant woman